Upgrader, Custom posttypes

* Upgrader also upgrades header, sidebar, footer
* Upgrader supports external reference, blogentries and testimonial
widget
* Support for public custom posttypes based on webpage pagetemplate
* Removed public property for custom posttypes systemlog, admin,
settings, menu
* Removed pagelet from list of custom posttypes (deprecated)
* Bio widget; handls empty header_vertical_alignment values as 'top'.